Mel Gibson sent several threatening emails to Oksana Grigorieva and those emails are now part of the investigation into his actions, a source familiar with the situation tells RadarOnline.com exclusively.

RadarOnline.com has exclusively obtained the wording of several of Mel’s scary emails, which help explain why Oksana has constantly insisted that Mel needs help.

On February 18 Mel and Oksana’s relationship imploded after he accused her of smiling at a worker during a tree-planting ceremony honoring their daughter Lucia. Mel made approximately 30 phone calls to Oksana that night and she recorded some of them.

“She left his Malibu house after they had a fight and went back to the house in Sherman Oaks,” the source said. “Mel was abusive, threatening and full of rage. When he said, ‘safe is best,’ Oksana knew that meant she would only be safe away from him.

Oksana alleges that Mel punched her in the mouth and left temple on January 6. She has photographic evidence backing up damage to her mouth and also photographic evidence showing bruising around her left eye. RadarOnline.com has published photos showing the damage.

We also reported exclusively that she was diagnosed with a concussion as a result.

Oksana repeatedly told Mel that he needed help or medication. But Mel lurched from crazed rages to apologies, said the source.